Dragon Age II gets high-res texture patch for PC

Dragon Age 2 is officially launched in North America today and BioWare has decided to celebrate its arrival with a little treat for PC gamers. Folks playing the sequel on a well-specced machine can download a high-resolution texture patch that adds an option to enable higher detail replacements for most textures in the game. We haven't seen a before and after comparison, but BioWare says the enhanced visuals are especially noticeable on level art.

For those who are in the USA and Pre-Ordered the game through Steam, is it already playable? I'm in South America and its still locked... (I know this has nothing to do with the topic above)

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The game according to Bioware has been regionally locked, so even if you have a copy from say retail and installed it you wont be able to play until the game officially launches in your region and can validate with their servers from my understanding.